<html><head>
<meta http-equiv="content-type" content="text/html; charset=gbk">
<script type="text/javascript" src="loadtext_data/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
  $("button").click(function(){
    $("p").css("background-color","red");
  });
});
</script>
</head>

<body>
<h2>This is a heading</h2>
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>
<button type="button">Click me</button>


</body></html>